[turbofan] Split pure nodes in the scheduler if beneficial.

test/mjsunit/asm/redundancy1.js

Index: test/mjsunit/asm/redundancy1.js
diff --git a/test/mjsunit/asm/redundancy1.js b/test/mjsunit/asm/redundancy1.js
new file mode 100644
index 0000000000000000000000000000000000000000..c7e0e37453c6b9a5b6792dd389d3b8993306b780
--- /dev/null
+++ b/test/mjsunit/asm/redundancy1.js
@@ -0,0 +1,26 @@
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --turbo-splitting
+
+function module(stdlib, foreign, heap) {
+    "use asm";
+    function foo(i) {
+      var j = 0;
+      i = i|0;
+      if (i < 0) {
+        j = i+1|0;
+      }
+      if (i > 0) {
+        j = i+1|0;
+      }
+      return j;
+    }
+    return { foo: foo };
+}
+
+var foo = module(this, {}, new ArrayBuffer(64*1024)).foo;
+assertEquals(0, foo(0));
+assertEquals(0, foo(-1));
+assertEquals(12, foo(11));